Operating instructions

15
MAST MOUNTINGS
There are several mounting arrangements available for the installation of masts.
They can be mounted either internally or externally to a vehicle or building. For
erecting masts on open ground, base guy assemblies are available; they are the
strongest for field mounting. For the NH, NK, NL and NX series, field stands have
been designed specifically for the purposes, up to extended height of 18m.
Side Mounting Brackets
For mounting masts to a vertical surface of a vehicle or building, the set includes two
brackets. The aluminium top bracket has one half detachable to allow for removal of
the mast without disturbing the bracket fixings. It incorporates Teflon bearing rings to
protect the mast. The lower bracket has a PTFE disk to permit easy rotation of the
mast and thumbscrew for locking in any azimuth direction. On the NX and NY series,
the bracket is galvanised steel with aluminium base plate and collar break.
The dimensions for drilling the mounting holes are shown on pages 16 and 17. Note
that for the NY series, the bottom bracket has two additional holes. It is important that
the correct size bolts are used as shown in the table. It is important also when bolting
to a vertical surface to ensure that the structure is strong enough or suitably
reinforced to take the loads. If any doubt, please contact supplier/manufacturer for
specific loadings for each mast.
All of the lower mountings are fitted with M6 screws on each side. After the
installation of the mast, these screws should be tightened and adjusted to permit the
mast to rotate but to prevent it from disengaging vertically from the bearing. It is
important that the upper and lower bearings are aligned carefully to permit the mast
to rotate easily.